Mission mode as DLC is a swindle!
Without the Mission mode, the player is left with the story mode. It's a shame that the story is weak - the levels seem only tenuously related; a chance to play through different environments without much tying them together. It is not something I find inclined to revisit.
New weapons - great fun, especially the dual-wielded ones
New nimpo - not that great, the targeting system feels out of place
New enemies - initially fun but predictable before long
Biggest con - Mission mode as DLC!!